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/**
 * Licensed to The Apereo Foundation under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 *
 * The Apereo Foundation licenses this file to you under the Educational
 * Community License, Version 2.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of the License
 * at:
 *
 *   http://opensource.org/licenses/ecl2.txt
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations under
 * the License.
 *
 */

package org.opencastproject.series.impl.persistence;

import java.util.Collections;
import java.util.Date;
import java.util.Map;
import java.util.TreeMap;

import javax.persistence.Access;
import javax.persistence.AccessType;
import javax.persistence.CollectionTable;
import javax.persistence.Column;
import javax.persistence.ElementCollection;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.IdClass;
import javax.persistence.Index;
import javax.persistence.JoinColumn;
import javax.persistence.Lob;
import javax.persistence.MapKeyColumn;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.UniqueConstraint;

/**
 * Enitity object for storing series in persistence storage. Series ID is stored as primary key, DUBLIN_CORE field is
 * used to store serialized Dublin core and ACCESS_CONTROL field is used to store information about access control
 * rules.
 *
 */
@Entity(name = "SeriesEntity")
@IdClass(SeriesEntityId.class)
@Access(AccessType.FIELD)
@Table(name = "oc_series",
    indexes = {
        @Index(name = "IX_oc_series_modified_date", columnList = ("modified_date")),
    }
)
@NamedQueries({
    @NamedQuery(
        name = "Series.findAll",
        query = "select s from SeriesEntity s where s.deletionDate is null"
    ),
    @NamedQuery(
        name = "Series.getCount",
        query = "select COUNT(s) from SeriesEntity s where s.deletionDate is null"
    ),
    @NamedQuery(
        name = "seriesById",
        query = "select s from SeriesEntity as s where s.seriesId=:seriesId and s.organization=:organization"
    ),
    @NamedQuery(
        name = "Series.getAllModifiedSince",
        query = "select s from SeriesEntity as s "
            + "where s.modifiedDate >= :since and s.organization=:organization "
            + "order by s.modifiedDate asc"
    ),
    @NamedQuery(
        name = "Series.getAllModifiedInRange",
        query = "select s from SeriesEntity as s "
            + "where s.modifiedDate >= :from and s.modifiedDate < :to and s.organization=:organization "
            + "order by s.modifiedDate asc"
    ),
})
public class SeriesEntity {

  /** Series ID, primary key */
  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  @Column(name = "id", length = 128)
  protected String seriesId;

  /** Series ID, primary key */
  @Id
  @Column(name = "organization", length = 128)
  protected String organization;

  /** Serialized Dublin core */
  @Lob
  @Column(name = "dublin_core", length = 65535)
  protected String dublinCoreXML;

  /** Serialized access control */
  @Lob
  @Column(name = "access_control", length = 65535)
  protected String accessControl;

  @Column(name = "modified_date", nullable = false)
  @Temporal(TemporalType.TIMESTAMP)
  protected Date modifiedDate = new Date();

  @Column(name = "deletion_date")
  @Temporal(TemporalType.TIMESTAMP)
  protected Date deletionDate = null;

  @Lob
  @ElementCollection(targetClass = String.class)
  @MapKeyColumn(name = "name", nullable = false)
  @Column(name = "value", length = 65535)
  @CollectionTable(name = "oc_series_property", uniqueConstraints = {
      @UniqueConstraint(name = "UNQ_series_properties", columnNames = {"series", "organization", "name"})
      }, joinColumns = {
          @JoinColumn(name = "series", referencedColumnName = "id", nullable = false),
          @JoinColumn(name = "organization", referencedColumnName = "organization", nullable = false) })
  protected Map properties;

  @ElementCollection
  @MapKeyColumn(name = "type", length = 128, nullable = false)
  @Column(name = "data")
  @CollectionTable(name = "oc_series_elements", uniqueConstraints = {
      @UniqueConstraint(name = "UNQ_series_elements", columnNames = {"series", "organization", "type"})
      }, joinColumns = {
      @JoinColumn(name = "series", referencedColumnName = "id", nullable = false),
      @JoinColumn(name = "organization", referencedColumnName = "organization", nullable = false) })
  protected Map elements;

  /**
   * Default constructor without any import.
   */
  public SeriesEntity() {
  }

  /**
   * Returns series ID.
   *
   * @return series ID
   */
  public String getSeriesId() {
    return seriesId;
  }

  /**
   * Sets series ID. ID length limit is 128 characters.
   *
   * @param seriesId
   */
  public void setSeriesId(String seriesId) {
    if (seriesId == null) {
      throw new IllegalArgumentException("Series id can't be null");
    }
    if (seriesId.length() > 128) {
      throw new IllegalArgumentException("Series id can't be longer than 128 characters");
    }
    this.seriesId = seriesId;
  }

  /**
   * Returns serialized Dublin core.
   *
   * @return serialized Dublin core
   */
  public String getDublinCoreXML() {
    return dublinCoreXML;
  }

  /**
   * Sets serialized Dublin core.
   *
   * @param dublinCoreXML
   *          serialized Dublin core
   */
  public void setSeries(String dublinCoreXML) {
    this.dublinCoreXML = dublinCoreXML;
  }

  /**
   * Returns serialized access control
   *
   * @return serialized access control
   */
  public String getAccessControl() {
    return accessControl;
  }

  /**
   * Sets serialized access control.
   *
   * @param accessControl
   *          serialized access control
   */
  public void setAccessControl(String accessControl) {
    this.accessControl = accessControl;
  }

  /**
   * @return the organization
   */
  public String getOrganization() {
    return organization;
  }

  /**
   * @param organization
   *          the organization to set
   */
  public void setOrganization(String organization) {
    this.organization = organization;
  }

  public Date getModifiedDate() {
    return this.modifiedDate;
  }

  public void setModifiedDate(Date date) {
    this.modifiedDate = date;
  }

  public Date getDeletionDate() {
    return this.deletionDate;
  }

  public void setDeletionDate(Date date) {
    this.deletionDate = date;
  }

  public boolean isDeleted() {
    return this.deletionDate != null;
  }

  public Map getProperties() {
    return new TreeMap(properties);
  }

  public void setProperties(Map properties) {
    this.properties = properties;
  }

  public Map getElements() {
    return Collections.unmodifiableMap(elements);
  }

  public void addElement(String type, byte[] data) {
    elements.put(type, data);
  }

  public void removeElement(String type) {
    elements.remove(type);
  }
}